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Rapid depletion of fossil fuels is urgently demanding an extensive research work to find out the viable alternative fuel for meeting sustainable energy demand without any environmental impact. In the future, our energy systems will need to be renewable, sustainable, efficient, cost-effective, convenient and safe. Therefore, researchers has shown interest towards alternative fuels like vegetable oils, alcohols, LPG, CNG, Producer gas, biogas in order to substitute conventional fuel i.e. diesel used in compression ignition (CI) engine. However, studies have suggested that trans-esterified vegetable oils retain quite similar physico-chemical properties comparable to diesel. Besides having several advantages, its use is restricted due to higher emissions i.e. NOx, CO, HC and deposits due to improper combustion. Hence, there is a need of cleaner fuel for diesel engines for the forthcoming stringent emissions norms and the fossil depletion.